Nanocellulose: Isolation, Characterization, and Capability of Technical Applications.
Nanocellulose crystal (NCC) was isolated and prepared from Microcrystalline cellulose (MCC) by hydrolysis with different catalysts, such as cation exchange resin and sulfuric acid, etc. Polyvinyl alcohol (PVA) composite films were prepared by adding NCC into a PVA matrix at different loading levels. Moreover, the structure, physical and chemical properties of NCC and composite films were investigated by electron microscopy, AFM, XRD, thermo gravimetric analysis, etc. The results show that the diameter of NCC is about 10-40 nm, with the length 100-400 nm. Regular short rod-like NCC is obtained by sulfuric acid hydrolysis, long and thin crystals of cellulose is obtained by cation exchange resin．Compared with MCC, the crystallinity of NCC prepared from sulfuric acid hydrolysis and cation exchange resin catalytic hydrolysis increases from 72.25 ％ to 77.29 ％ and 84.26 ％, respectively．Furthermore, the rheological behavior of NCC was also studied．The results show that NCC in water can produce very stable suspension and NCC is the shear thinned pseudo plastic fluid. As the temperature increases, its viscosity decreases，and gradually tends to be smooth，which indicates that the sample enjoys strong stability. On the other hand， NCC also has homogenous dispersion in the polymer matrix. Compared with the neat PVA film, the PVA films reinforced by nanocellulose crystal exhibit better mechanical properties. When the NCC content is only 0.5％, the tensile strength of composite film increases 45.7％, up to 51MPa. The thermal stability of the PVA composite films slightly increases when NCC is added.
nanocellulose crystal isolation polyvinyl alcohol composite films characterization
Biao HUANG Li-rong TANG Wen OU Yan-dan CHEN Xue-rong CHEN Da-song DAI Tao LI
College of Material Engineering,Fujian Agriculture and Forestry University，Fuzhou 350002，China
国际会议
南京
英文
420-424
2010-10-22（万方平台首次上网日期，不代表论文的发表时间）